Telephone apparatus



H. C. EGERTON.

TELEPHONE APPARATUS.

APPLICATION FILED JAN. 8. ma.

1,365,898. Patented Jan. 18, 1921.

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H. C. EGERTON.

TELEPHONE APPARATUS.

APPLICATION FILED JAN. 8. 191a.

1,365,898. Patented Jan. 18,1921.

2 SHEETS-SHEET 2- /n Vania/ Henry 6. [qr/fan.

UNITED STATES HENRY C. EGERTON, OI PABSAIC, NEW JERSEY, ASBIGNOR 'IO WESTERN ELECTRIC i PATENT OFFICE.-

COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 0! NEW YORK.

TELEPHONE APPARATUS.

Specification of Letters Patent.

Patented Jan. 18, 1921.

Application flied January 8, 1918. Serial No. 210,850.

To all whom it may concern Be it. known that I, HENRY CLIFFORD EoEn'roN, a citizen of the United States, residing at 63 Bond street, Passaic, 1n the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Telephone Apparatus, of which the following is a full, clear, concise, and exact description.

This invention relates to telephonic apparatus, and more especially to magnetic structures for use in such apparatus, being particularly suitable to loud speaking telephone receivers.

An object of this invention is the production of a highly efficient'ma et system for telephonic apparatus, whic is compact, rigid and of firm parts, readlly assembled and adjusted.

In accordance with this invention a magnet is provided with pole pieces with which are associated rigid members secured to the ole pieces, and by which, when the air gap Between the pole pieces has once been determined, the pole pieces are held in corresponding spaced relation to maintain this definite air gap. These pole pieces and members form an inclosure within which a translating coil may be mounted.

Other objects and features of the invention will be apparent from the following description.

This invention is illustrated in several embodiments in the accompanying drawings, wherein- Figure 1 shows in erspective a loud speaking receiver containing a magnet system embodying features of this invention; Fig. 2 is an exploded view of the pole piece and coil arrangement shown in Fig. 1; Fig. 3 shows a vertical cross-section of the receiver of Fig. 1 taken on the line 3-3 thereof; and Figs. 4 and 5 show modifications of the pole piece mounting of Fig. 1.

In the construction shown in Fig. 1, the magnetic structure comprises a permanent magnet 6, to opposite ends of which magnetic pole pieces 7 and 8 are respectively secured. Each pole iece is provided with a pair of pole extensions 9, 9 which are separated to receive a pair of translating coils 10, 10 therebetween. Spacing pins 11 are provided to aid in holding the coils in place, and to provide a space in whichresilient torsion members 12, 12, carrying an armature 13 of magnetic material firmly secured to these members, may move without touchmg the coils. The pole piece 7 is secured to the upper side of the magnet 6 and the pole piece 8 to the lower side thereof, so as to ring the pole extensions 9, 9 of one ole piece opposite the pole extensions 9, 9 o the other pole piece. he coils 10 are located on opposite sldes of the members 12 with the respective ends 14 and 15 of the armature 13 extending through the open centers of the 0011s, the centers being made of such size that movement of the armature during operation of the receiver is "not interfered with. The ends of the armature 13 extend between the respective pairs of pole extensions 9, 9 of the pole (pieces 7 and 8, and the end 15 carries a ro 16 secured to a vibratory diaphragm 17, as shown in Fig. 3.

In order that eflicient and uniform opera tion be obtained in apparatus of this character, it is of great importance that a construction be provided in which the pole pieces can be adjusted to secure the most desirable airgap relation and rigidly maintained in this position. The present construction provides for relative longitudinal, transverse and vertical adjustment of the pole pieces, so that slight inequalities in the various parts are easily compensated for in adjustment. .To accomplish this purpose L-shaped members 18 .of'ri id non-magnetic material are provided. ach of these members 18 is secured to its companion pole piece by a screw 19 passing through an opening 20 in such pole piece, and engaging a threaded recess 21 in such member. he openings 20 are preferably counterbored to receive the head of the screw 19, and both the opening and counterbore are larger than the shank of the screw and the head, respectively, so that the members 18 can be adjusted both longitudinally and transversely relative to their companion pole piece. The members 18 are also provided with grooves 22 desi ed to receive screws 23, for which threade recesses 24 are provided in the respective opposing pole pieces. The grooves 22 are slightly wider and deeper than the threaded portion of the screws 23, to provide for both vertical and transverse adjustment of the screws therein.

Sleeves 25 are carriedby the screws 23, to space the members 18 a definite distance from their respective opposing pole piece, the members 18 providing sufficient bearing for the sleeves 25 and the heads of the screws 23, so that after these parts are properly adjusted, they will be rigidly held against accidental movements.

In order to explain the method by which the pole pieces are adjusted relative to each other, assume that the pole extensions 9 of the pole pieces 7 and 8 are separated too far vertically, and are also out of both longitudinal and transverse alinement. The screws 34 and 36 are first loosened and then with the members 18 held tightly in position on their companion pole pieces, the latter are moved vertically to obtain the proper air gap between them; whereupon the screws 23 are tightened. The transverse alinement of the pole pieces can also be obtained either wholly or in part in this step of the adjusting operation through the engagement of the screws 23 with the members 18; If still further adjustment is necessary to obtain'proper transverse alinement, either one or both of the screws 19 may then be loosened, and the pole pieces moved into proper transverse position. The screws 19 may then be tightened again to retain this adjustment and after proper positioning of the nut 39, should this be necessary to compensate for the change in vertical adjustment, the screws 34 and 36 will next be tightened, thus completing the adjusting operation. It will be noted that each of the pole pieces is mechanically secured to the other by the two members 18 and the screws and sleeves coacting therewith to provide a structure wherein each of the parts so braces the others as to retain the parts in adjustment, even though the apparatus be subjected to severe jar or vibration. A rectilinear housing is also formed through this construction of a size to hold the coils in place; the pins 11 serving to space the coils apart to prevent their interfering with the movement of the members 12-12.

The mounting of the armature 13 is such that it can be independently adjusted without disturbing the relative adjustment of the pole pieces 7 and 8. This is accomplished by providing an opening 26in each of the members 12, which are slightly lon er and wider than the threaded portion 0 a screw 27, adaptedto pass therethrough for engagement with a threaded recess 28 in its respective member 18. A delicate trans verse and vertical adjustment of the armature 13 is thereby provided and aids in producing a very sensitive and efficient receiver.

The pole extensions 9-9 of each of the pole pieces are of the same polarity as the 'therethrough induces magnetic flux in the armature, which changes-in direction and strength in accordance with the voice currents developing a corresponding variance in the attraction and repulsion of the armature 13, relat-ive to the pole extensions 99, to move the armature correspondingly against the torsion of the members 12-42. The armaturemovements are imparted to the diaphragm 17,which is thus set in ii bration and produces sounds corresponding to the telephonic currents traversing the coils 10.

The electromagnetic structure and the diaphragm may be mounted-in any suitable manner, and are shown as supported upon a front plate 30, preferably of non-magnetic 5 material, having a recess 31 at the rear thereof to receive the diaphragm 17 which is retained therein between annular washers 32-32, preferably of yielding material. A metallic retaining ring 33, preferably of non-magnetic material, is secured to the rear surface of the front )latc 30 to hold the diaphragm in place. he magnetic structure is secured to the plate 30 by screws 34, 35 and 36, extending through suitable openings in the magnet 6 and ring 33, to engage threaded recesses in the plate 30. The screws 34 and 36 are preferably of mag netic material and also extend through openings 37 and 38 in the respective pole pieces 8 and 7, and thus also serve to secure these pole pieces to the magnet G. The screw 34 clamps the pole piece 8 firmly between the magnet 6 and ring 33, whereas the screws 35 and 36 are each provided with lock nuts 39 and 40; the former serving to hold the magnet 6 against movement relative to these screws, and the latter serving to lock the screws in place after adjustment to space the magnet 6 the desired distance from the plate 33.

The front plate 30 has an extension 41 with a sound opening 42 theretln'ough, the extension being designed to support a suitable horn (not shown). In practice a suitable casing (not shown) would be secured to the front plate 30, to inclose the working parts of the receiver and protect them against exposure. Binding posts 43 are carried by the front plate for connection to an exterior telephonic circuit, and conductors 44, connecting the binding posts with the coils 10, would serve to convey the actuating telephonic currents to these coils to operate the receiver.

The modification shown in Fi 4 differs from the construction shown in igs. 1 to 3 piece 8', relative to the pole piece 7 as well extending between said as relative to. the end 47 of the magnet. The construction is otherwise substantially the same as shown in Fig. 1.

Fig. 5 shows in full lines a pair of members 49, which ma be used in place of the members 18 and s eeves 25, shown in Fig. 1; the angular extensions 50 on the members 49 takin the places of thespacing sleeves 25. he pole pieces 7 and 8 are shown in dotted lines to indicate their position relative to the members 49.

.What is claimed is:

1. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and adjustable to vary the air gap therebetween, a pair of rigid members extending between said pole pieces, and means coo crating with said pole pieces and rigid members to adjust the air gap between said pole pieces and to rigidly maintain the adjusted position therebetween.

2. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet arranged in overlapping parallel spaced relation to each other and adjustable to vary the overlapping relation therebetween, a pair of rigid members extending perpendicularly to overlapping portions of each of said pole pieces'to maintain the spaced relation therebetween, and means cooperating with said pole pieces and rigid members to adjust the overlapping relation between said pole pieces and to rigidly maintain the adjusted position therebetween.

3,. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet arranged in overlapping parallel spaced relation to each other and adjustable to vary both the air gap and the overlapping relation therebetween, a pair of rigid members ole pieces, and means cooperating with said pole pieces and rigid members to adjust both the air gap and overlapping relation between said pole pieces and to rigidly maintain the adjusted position therebetween.

4. A magnetic structure comprising a magnet having its opposin poles op ositely directed in overlapping relation, and means interposed between said overlapping poles to 1maintain a spaced relation between such po es.

5. A ma netic structure comprising a magnet, po e pieces attached thereto and rojecting beyond the ends of said magnet in oppositely directed overlapping relation, and means lnterposed between the projecting end of one pole piece and the other pole piece to position said pole pieces relative to each other. v

6. A magnetic structure comprising a magnet having its ends adjacent, pole pieces for said magnet ends each extending toward the opposite end of the magnet and beyond the other pole piece, and means interposed between the pole pieces to position said pole pieces relative to each other.

7. A magnetic structure comprising a magnet having its ends adjacent, angular pole pieces for said magnet ends each extending beyond the opposite pole piece in alinement with the magnet and angularly toward the opposite pole piece, and means interposed between the pole pieces to position said pole pieces relative to each other.

8. A magnetic structure comprising a magnet havlng a pole piece at each end, said pole pieces being attached at one end to their respective ends of the magnet and having their other ends free and arranged in spaced overlying relation to each other, and a pair of rigid members, one having one end thereof rigidly secured to the free end of one pole piece and the other end having one end thereof rigidly secured to one end of the other pole piece, the other end of the one member being rigidly secured to the other pole piece, and the other end of the other member being rigidly secured to the one pole piece, to maintain the spaced relation between said pole pieces.

9. A magnetic structure comprising a magnet having a pole piece at each end, said pole pieces being attached at one end to their respective ends of the magnet and having their other ends free and arranged in spaced overlying relation to each other, and a pair of rigid members secured to the free ends of said pole pieces and to said pole pieces at a point spaced from the free ends thereof to maintain the spaced relation between such pole pieces.

10. A magnetic structure comprising a magnet having a pole piece at each end, said pole pieces being attached at one end to their respective ends of the magnet and having their other ends free and arranged in spaced overlying relation to each other, and a pair of rigid members each secured at one end to the free end of a different one of the olepieces and each having the other end rmly secured to a portion of the magof, and means including said members for adjusting the spaced relation between said pole pieces.

12. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in overlapping spaced relation relative to each other, a pair of rigid L- shaped members extending between and rigidly secured to said pole pieces to rigidly maintain the spaced relation therebetween, an armature movable between said pole pieces, and an armature mounting secured to the inner portions of corresponding legs of the L-shaped members.

13. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet in overlapping spaced relation,- :1 pair of members extending between and secured to overlapping portions of said pole pieces, and a stationary coil located in the space inclosed between and by said pole pieces and said members, said pole pieces and members providing a housing for said coil and holding it against movement.

l lfIn telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet in overlapping spaced relation, a pair of spaced pole extensions on each of said pole pieces arranged at substantially right angles to said pole pieces, the pole extensions on each pole piece extending toward and arranged in overlapping relation to the extensions of the other pole piece, a pair of members extending between and secured to overlapping portions of each of said pole pieces, said members being arranged at substantially right angles to both said pole pieces and said'pole extensions to cooperate therewith to provide a chamber therebetween, and a coil inclosed in said chamber.

15. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in voverlapping spaced relation, a pair of members extending between and secured to overlapping portions of each of said pole pieces, an armature, means to mount said armature upon said members for movement between the overlapping portions of said pole pieces, and a stationary coil surrounding said armature located in the space inclosed by and between said pole pieces and members, and held against movement by said pole pieces and members.

16. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in overlapping spaced relation, a pair of members extending between and secured to overlapping portions of each of said pole pieces to maintain said pole pieces in spaced relation, an armature, and adjustable means to support said armature upon said members for movement between the overlapping portions of said pole pieces and to vary the normal air gap between said armature and pole pieces.

17. In telephonic apparatus, a magnet, a pair of pole ieces carried by said magnet and arrange in overlapping adjustable spaced relation, a pair of rigid members extending between and adjustably secured to overlapping portions of each of said pole pieces to maintain-the rigid adjusted spaced relation therebetween, an armature supported for movement between the overlapping portions of said ole pieces, and means for adjusting the position of said armature relative to said pole pieces.

18. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in overlapping adjustable spaced relation, a pair of rigid members extending between and adjustably secured to overlapping portions of each of said pole pieces to maintain the rigid adjusted spaced relation therebetween, an armature supported for movement between the overlapping portions of said pole pieces, and means secured to said members for adjusting the position of said armature relative to said pole pieces independent of the adjustment of the pole pieces relative to each other.

19. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in overlapping spaced rela tion, a pair of rigid members extending between and secured to overlapping portions of each of said pole pieces to maintain said pole pieces in spaced relation, an armature, a torsional mounting for said armature secured to said members to position said armature for movement between the overlapping portions of said pole pieces, said torsional mounting normally maintaining said armature in a definite spaced relation relative to said pole pieces.

20. In telephonic apparatus, a magnet, a pair of pole pieces carried by said magnet and arranged in overlapping spaced relation, a pair of members extending between and secured to each of said pole pieces, a movable armature, a torsional mounting for said armature secured to said members, a pai of stationarycoils surrounding said armature and arranged on opposite sides of said torsional mounting, and means to prevent said coils engaging said mounting.

21. In telephonic apparatus, a magnet, a pair of pole pieces carried thereby and arranged in overlapping spaced relation, ,a pair of spaced pole extensions on each of tending between and secure 1,aes,ees

said pole pieces, the extensions on each pole piece extcndin toward and arranged in overlapping re ation to the extensions of the other pole piece, a pair of ti id members exto overlapping portions of each of said ole pieces, to maintain the spaced relation ereof, an armature mounted for movement between said 1e extensions, and a coil surrounding'sai armature. 10 In witness whereof, I hereunto subscribe my name this 29th day of- December, A. D.

HENRY O. EGERTON. 

